Pulverizing machine



April l5 1924.

E. H. ELZEMEYER K PULVERIZING MACHINE iled March 5, 1923 surface, the teeth Patented Apr. l5, i924.

masas PATENT oFF-ics.

ERNST H. ELZEMEYER, OF ST. LOUIS, MISSOURI, ASSIGNOR 'JTO AMERICAN PUL- VERIZER COMPANY, -OF ST. LOUIS, MISSOURI, A CORPORATION OF MISSOURI.

PULVERIZING MACHINE.

Application led` March 3, 1923. Serial No. 622,562.

To'all whom t may concern:

Be it known that l, ERNST H. ELZEMEYER, a citizen of the United States, and a resident of the city of St. Louis, in the State of Missouri, have invented a new and useful Improvement in Pulverizing Machines, of which the4 following is a specification.

This invention relates to pulverizing machines of the type shown in Knittel Patent No. 1,424,922, dated August 8th, 1922, wherein a rotator loosely supports a series of circumferentially spaced alternately arranged plain and notched rin hammers adapted to cooperate with the grinding concaves and grate bars of the pulverizer.

'In the above pulverizer, diiiiculty is sometimes experienced with tenacious substances by reason of the resistance of their parts to separate under the combined pounding 4and rolling action of the hammer rings and by reasonof the tendency for such substances to accumulate and pack in a fairly smooth layer and thereby impair the operation of the machine.'

rlhe principal object of the present invention is to produce a ring shredder for pulverizers adapted to overcome the diiculties and disadvantages hereinbefore mentioned. Other objects are to make such `a ring as simple, cheap, stron durable and compact as practicable. The lnvention consists principally in a shredder ring for pulverizers having a series of teeth formed in its outer of adjacent series being circumferentially offset or staggered with relation to each other; and it further consists in the arrangements and combinations of parts In the accompanying drawing, wherein like reference numerals refer to like parts wherever they occur,

Fig. 1 is a vertical transverse section through a pulverizer provided with ring` Shredders embodying my invention;

Fig. 2 is a detail perspective view of one,

of the ring Shredders shown in Fig. 1;

Fig. 3 is a face view of a modied form of ring shredder; and

Fig. d is an edge view thereof partly in section.

Referring to Fig. 1 of the accompanying drawing, my invention is illustrated in connection with a pulverizer comprising an upper casing 5 and a lower casing 6 having hereinafter described and claimed.`

removable sections 7 for clamping them together. The main shaft 8 is mounted in bearings formed in the end walls of the lower casing. Each end wall of the lower casing is provided with a flange 9 which supports the ends of the grinding concave 10 and the grate bars 11. The end walls of the lower casing are secured together by means of rods 12 located inside the casing below the grinding concave and the grate bars. Mounted on the shaft 8, in the recess formed in the inner face of the end walls of the casing, are end plateshor disks 13. These disks are keyed to the shaft 8 so as to be rigid therewith and are connected to each other near the outer edge by a series of spaced parallel rods 1li- Arranged on the series of rods 14 are grinding rings 15 and shredding or cutting rings 16. Mounted on the shaft 8 between the disks 13 are spiders 17, whose radially extending arms 18 are perforated to ref'f 'n the supporting rods 14, thereby forming supports for said rods 'intermediate their ends. The radially extending arms 18 of the spiders 17 serve to space the grinding rings 15 and the shredding rings 16 which are arranged in alternation on the supporting arms. This same arrangement of spacing is carried out in the angular spacing of the grindingfrings and the shredding rings on the supporting rods 14. The hub portions of the spiders are keyed to the shaft 8 and abut against each other, thereby spacing the arms of the spiders the desired distance from each other.

Each shredding ring 16 has two series of notches cut into its periphery, forming a double series of circumferentially spaced teeth or blades 19, the teeth of one series being oset or staggered circumferentially with relation to the teeth of the other series,` and the distance between the teeth being preferably greater than the circumferential length thereof. The' front faces of the teeth of the shredding rings form cutting surfaces; and the peripheral surfaces ofthe teeth which are elongated through a considerable arc and are concentric with the axis of the ring, act as. grindin surfaces fin the same manner as the perip eral surfaces of the grinding rings 15. The front and rear faces of the teeth of the shredding rings are disposed radially with respect to the axis of the ring, whereby said rings are symmetrical. By reason of this fact the shredder ring may be used in a reverse position when the cutting faces of the Same become worn. The rings are loosely mounted on their supporting rods so as to move bodily inward upon striking an obstruction.y

By this arrangement described, the cutting edges of the rapidly moving shredder' rings serve to hack or cut the material and act as plows or diggers to loosen any material which tends to pack on the grinding surfaces of the machine, whereby the pulverizer is adapted for handling tenacious substances, such as steel turnings, coke, shellac, asphalt, and soap, and fibrous Inaterials such as asbestos and hay.

The ring shredder 16aL shown in Figs. 3 and 4 comprises a plurality of thin annular plates having teeth 19'El formed at their outer edges. The plates ai'e riveted or otherwise rigidly secured together, as at 20, with their cutting edges overlapped. This form of shredding ring is particularly adapted for use in cutting fibrous materials such as asbestos and hay which require a sharper cutting edge for proper disintegration.

What I claim is:

1. A shredder ring for a pulverizing machine of the kind described, said ring having a heavy annular body with a relatively large central hole and with radial projections whose outer surfaces are arcuate and l substantially equidistant from the center of the ring, such projections being disposed in a plurality of parallel planes and with the projections in one plane staggered with respect to the projections of the adjacent plane.

2. A shredder ring for a pulverizing machine of the kind described, comprising a heavy annular body with a large central hole and having radial projections on its outer surface, the front and rear faces of said projections being `substantially radial and forming cutting faces, the rojections being arranged in two planes witlh the projections in one plane staggered with relation to the projections in the adjacent plane. l

3. A shredder ring for pulverizing ma"-v chines of the kind described comprising an annular body with a large central hole whose outer surface is offset outwardly at intervals to form a plurality of series of radial cutting faces, the cutting faces of adjacent series being offset circumferentially with relation to each other, andthe outer surfaces of said ring being arcuate and subinner andA outer surfaces are substantially i concentric but whose outer surface is offset at intervals to form two circular series of radial cutting faces, the arcuate length of the notches being greater than the arcuate length of the portions between them and the cutting faces of one series being located opposite the notches between the cutting faces of the other series.

6. A shredder ring for pulverizing machines of the kind described comprising a plurality of annular plates whose outer surfaces are offset at intervals to form teeth with substantially radial faces and elongated outer surfaces concentric with the axis of the ring, said plates being rigidly secured together with the cutting surfaces thereof in overlapped relation.

7. A pulverizing machine comprising a casing having grinding surfaces, a rotator, and heavy rings loosely supported by said rotator to rotate therewith to cooperate with said grinding surfaces, the peripheral surfaces of said rings being formed with a plurality of seriesof teeth, the kteeth of adjacent series being offset or staggered circumferentially 'with respect to each other.

8. In combination with a pulverizing machine comprising a casing having grinding surfaces and a carrier rotatably mounted therein, a ring loosely mounted on said carrier and adapted to cooperate with said grinding surfaces, some of said rings being plain rings and other of said rings eing'of substantially the same overall diameter as `the plain rings but having their periphery offset at intervals to form a plurality of series of cutting faces, the cutting faces of adjacent series being offset circumferentially with relation to each other.

Signed at St. Louis, Missouri, this 28th day of February, 1923.

ERNST H. ELZEMEYER. 

